Siemens SIMOTICS S-1FT7 User Manual

Configuration
5.4 Brake resistances (armature short-circuit braking)
S-1FT7 synchronous motors
122 Configuration Manual, 09/2018, A5E45099423B AA
Calculating the braking time
The values for calculation are provided in Chapter "Data sheets and characteristics
(Page 150)".
Braking time
t
B
= J
Tot
• n / 9.55 • M
Br
t
B
/ s = braking time
n
/ rpm = operating speed
M
Br
/ Nm = average braking torque
Moment of ine
r-
tia
J
Tot
= J
Mot
+ J
Ext
J
Tot
/ kgm
2
= moment of inertia
J
Mot
/ kgm
2
= motor moment of inertia
J
Ext
/ kgm
2
= external moment of inertia
Note
In determining the run
-on distance, consider the friction of the mechanical transmission
elements (included in the calculation as an allowance in M
B
) and the
switching delay times of
the contactors.
To avoid mechanical damage to the drive, mount mechanical stops at the end of the
absolute traversing range of the machine axes.

Siemens SIMOTICS S-1FT7 Specifications

General

Brand	Siemens
Model	SIMOTICS S-1FT7
Category	Engine
Language	English